Are there easy way(s) to tell if you have either too much or too little acid in your stomach?

I have some indegestion problem, like belching, gas etc. I was told that it could be caused by either too much acid or too little acid in your stomach.
Is there an easy way to test it?

My original concern is that I have mild gastritis, i.e., inflammatory stomach linings. Some people think it might be caused by too little stomach acid such that the bateria grows on it which causes the inflammation. I just want to test the acidity once for all.

Thanks a lot.

There are basically two ways to test for it, although neither of them are available to you as a lay person. In one of them, you swallow a small probe which measures the pH. The other is an endoscopy, where the doctor puts a tube down your throat and looks at your stomach to see if you have an ulcer or something. He can also do a test for a certain bacteria which is the cause of ulcers. This bacteria is easily treated with antibiotics, which would get rid of your problem if that is it. If it's not, then he can put you on some pills that will decrease the amount of acid if you have too much and some that will help if you have too little. A lot of belching and gas can also mean you have a gall bladder problem.

Basically, you can see that the problem is more involved and needs a doctor's advice.